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r= <2e^t,e^-t,2t>

So first i took the derivative and got velocity.

v=<2e^t,-e^-t,2>

Next i used the formula for arc length.

arc length = Integral from 0 to 1 of the norm of velocity.

The answer i got was 2e+e^(-1)-3

I am not sure if I am doing my integral right. I'd appreciate to see if someone gets the same answer that I do or tells me if i made a mistake somewhere.

Thanks!